He said the DOJ inspector general has been doing good work, but he's simply "overburdened," and a special counsel is necessary to get to the bottom of possible DOJ and FBI misconduct.

Biggs also expressed concern about the legitimacy of the basis of Special Counsel Robert Mueller's investigation, and how the probe has expanded far beyond its original scope.

"They're not going after crimes. They're not alleging that there were any crimes done," he said, noting that collusion -- even if it happened -- is not a crime in and of itself.

"They're just going through everything, trying to squeeze everybody, because they're investigating a person, not investigating a crime," Biggs said. "And that's an abuse of power. And if that's the case, then they themselves have committed crimes."

Former U.S. attorney and Fox News contributor Andy McCarthy said it’s “ridiculous” that some Democrats are complaining about Attorney General William Barr’s review of the origins of the Russia investigation.